A patient presents with numbness and tingling in the thumb, index, and middle fingers, and a positive Phalen's test. Which of the following interventions would be most appropriate to address the underlying cause of these symptoms?

A Administering oral corticosteroids to reduce inflammation systemically. B Applying heat therapy to the affected area to increase blood flow. D Performing finger stretching exercises to enhance flexibility. C Wrist splinting to maintain a neutral position during sleep.